74 



LEAVES. 



may be seen the cleft stipules or appendages of the leaf. 

 Linear, as the grasses and Indian corn, (Fig, 32, c,) represents 

 a leaf of this kind ; it is sheathing, or encloses the stem by its 

 base, as may be seen at d. 



Deltoid, from tjie Greek letter delta v ; this kind of leaf is 

 represented at e, Fig. 32 ; the Lombardy poplar affords an 

 example of the same. 



Fig. 33. 



Sagittate (from sagittus an arrow), or arrow-shaped leaf; this 

 is represented at a, Fig. 33 ; the Sagittaria, an aquatic plant, af- 

 fords an example of this leaf. 



Acerose, or needle-shaped ; this is represented at b, Fig. 33. 

 Leaves of this kind are mostly clustered together, as in the 

 pine ; they are subulate or pointed like a shoemaker's awl ; they 

 are rigid and evergreen. 



Trees with acerose leaves, are usually natives of mountain- 

 ous or northern regions ; any other kind of leaves would in these 

 situations be overpowered by the weight of snow or the vio- 

 lence of tempests ; but these admit the snow and wind through 

 their interstices ; their many points or edges, presented even to 

 a gentle breeze, produce a deep solemn murmur in the forest ; 

 and when the storm is abroad and the tempest high, 



"The loud wind through the forest wakes, 



Linear Sagittate Acerose. 



